Phenotypic variation and fitness of hatchling lizards

Abstract:

Variation in phenotype reflects variation in fitness; therefore, it is important to study the sources of phenotypic variation in order to understand the processes of natural selection. Phenotypes of hatchling reptiles are influenced by environmental factors, quantity or quality of yolk, and genetic contribution of the parents. The authors used eastern fence lizards (Sceloporus undulatus) to explore the effects of incubation moisture, maternal yolk investment, and clutch affiliation on phenotypes of hatchlings in the laboratory. Eggs from 28 clutches were distributed among wet and dry treatments, as well as a treatment in which yolk was removed. Hatchling performance traits were measured in the laboratory. Growth and survival under natural conditions were assessed by release and recapture of hatchlings in the field. The authors found that hatchlings from the wet treatment were bigger than those from the dry and yolk …

Año de publicación:

2003

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